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Usman, Mustofa and Elfaki, Faiz A. M. and Daoud, Jamal I (2008) EXPERIMENTAL DESIGN FOR SCIENTISTS AND ENGINEERS. International Islamic University Malaysia Press, Kuala Lupur, Malaysia. ISBN ISBN 978-983-3855-34-6

Usman, Mustofa and Ruswandi, Rudi and Daoud, Jamal I and Elfaki, Faiz A. M. (2008) BETA HAT MODEL AND ITS APPLICATION. In: International Conference On Quantitative Methods Used In Economics and Bussiness, 15-17 Oktober 2008, Bandar Lampung, Indonesia.